<!DOCTYPE html>
<html>
<head>
	<meta charset="utf-8">
	<meta name="viewport" content="width=device-width, initial-scale=1">
	<title></title>
	<style type="text/css">
		*{
			margin: 0;
			padding: 0;
		}
		.top{
			width: 100%;
			height: 60px;
			position: sticky;
             	top: 0;
             	z-index: 99;
		}
		.box{
			width: 1200px;
			height: 100%;
			margin: 0 auto;
		}
		.nav{
			width: 100%;
		}
		.box1{
			width: 100%;
		}
		.box2{
			position: fixed;
			top: 345px;
			left: 0px;
		}
		.box3{
			position: fixed;
			top: 345px;
			right: 0px;
		}
		.nav1{
			width: 50px;
			height: 50px;
			background: pink;
			position: fixed;
			right: 0;
			bottom: 0;
		}
	</style>
</head>
<body>
	<div class="top">
	    <img src="../../小黑子/top.png" class="nav">
	</div>
      <div class="box">
          <img src="../../小黑子/box.png" class="box1">
          <div class="nav1">
          	<a href="">返回顶部</a>
          </div>
      </div>

      <img src="../../小黑子/ad-l.png" class="box2">
      <img src="../../小黑子/ad-r.png" class="box3">
</body>
</html>